Hiu , Lauren, I am glad you are Back, I just tried to post a message on the BRIDGE in regards to a Technician having Problems with BUBBLES in the porcelain! When I posted @ 2 times a Message about ERROR kept coming up ! Here is the message I was trying to post to this Technician as follows :
"It is gas in the metal , which can come from various sources . As Darrack said Contamination from stones & burs & crucibles. However, it could also be "OVERHEATED METAL " when casting! There are various reasons for Contamination & Gas (Trapped)! Patrick!